There are two kinds of fungicide sprays that I have used and worked for me. Depending on what the sago palm is suffering with will depend on the fungicide to use. There are commercial fungicides use to treat T-Scale which might be the cause of this but I cant really tell. fungal infection is common to the Sago in Florida where it is humid. Sagos are best for Northern Florida and norther states. Where do you live?
Can you send a close up picture of the leaves?
You can start by removing all the browning leaves.
Also trim the lower ones to relieve stress.
THis picture below is from a website that talks about the Scale Infection of the Sago
IS this what your sago looks like?
I used Organicide and Liquid copper fungicide to remove all fungus and scales from some of my palms. Although the Organocide is not listed on this site, they do offer it. I know this because I called and ask.
You can also pick up these fungicides at a local garden center or Home depot or lowes. Do this ASAP. Once you get this, then apply as directed. The way to know if your palm has been cured is when you rub your fingers against the leaf where the scale is and if white comes off you have done a good job. If yellow or some other color persists then you need to re-apply.
This is from the site as well... It could also be this...
The fungus is fusarium. The scale is said to weaken the plants allowing the fusarium. to enter. The top fronds of sagos collapse, "seemingly overnight."
Same thing you can use to treat this.
A major problem is scale re-infection. Even if you kill off all the scales on your sagos, they can come back and frequently they do. They come from other infected sagos near your home. The point is, re-check often (say, monthly) with the finger test. If re-infection occurs, re-spray (the whole 4x or 5x cycle) all over again
The palm tree will recover with time. You may not see any improvement for a while. A to see a new leaf could take a few months. So patience and persistence is the key.
PLease I would like to see more photos... Myabe some one else can help as well.
And yes you can remove the seeds just by pulling them off, this will not hurt the seed or damage the palm. Also you don't have to spray them before sending, thank you thank you so much for doing this, I love Sago Palms just as much as you want to keep it alive. I want to help you make sure your sago stays alive. So let me know how the status is.
PLease grab all the ones around the soil too
Your the best
I will private message you my address...or if you have an email? you can private message me that as well.